Effects of Climatic Perturbations on the Surface-Ablation Regime of the Greenland Ice Sheet, West Greenland
Abstract The shift of the equilibrium-line altitude by climatic perturbations of air temperature δ T a , absolute humidity δρ v , cloudiness δ w and annual accumulation 6c in West Greenland (EGIG profile) is analyzed by heat-balance modelling. The perturbations δ T a = +1 K, δρ v = +0.25 g m −3 , δ...
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Language: | English |
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Cambridge University Press (CUP)
1989
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Online Access: | http://dx.doi.org/10.1017/s0022143000009229 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000009229 |
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crcambridgeupr:10.1017/s0022143000009229 2024-03-03T08:44:52+00:00 Effects of Climatic Perturbations on the Surface-Ablation Regime of the Greenland Ice Sheet, West Greenland Ambach, W. 1989 http://dx.doi.org/10.1017/s0022143000009229 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000009229 en eng Cambridge University Press (CUP) Journal of Glaciology volume 35, issue 121, page 311-316 ISSN 0022-1430 1727-5652 Earth-Surface Processes journal-article 1989 crcambridgeupr https://doi.org/10.1017/s0022143000009229 2024-02-08T08:42:50Z Abstract The shift of the equilibrium-line altitude by climatic perturbations of air temperature δ T a , absolute humidity δρ v , cloudiness δ w and annual accumulation 6c in West Greenland (EGIG profile) is analyzed by heat-balance modelling. The perturbations δ T a = +1 K, δρ v = +0.25 g m −3 , δ c = +50 kg m −2 result in a shift of the equilibrium-line altitude of 87.5, 9.8, and −24.3 m, respectively, while perturbations in cloudiness are negligible. The most important influence originates from changing air temperature, as air temperature affects daily heat-flux density of melt and duration of the ablation period. In regimes with negative values of the gradient of annual accumulation, the shift of the equilibrium line is enhanced. Article in Journal/Newspaper Greenland Ice Sheet Journal of Glaciology Cambridge University Press Greenland Journal of Glaciology 35 121 311 316 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Earth-Surface Processes |
spellingShingle |
Earth-Surface Processes Ambach, W. Effects of Climatic Perturbations on the Surface-Ablation Regime of the Greenland Ice Sheet, West Greenland |
topic_facet |
Earth-Surface Processes |
description |
Abstract The shift of the equilibrium-line altitude by climatic perturbations of air temperature δ T a , absolute humidity δρ v , cloudiness δ w and annual accumulation 6c in West Greenland (EGIG profile) is analyzed by heat-balance modelling. The perturbations δ T a = +1 K, δρ v = +0.25 g m −3 , δ c = +50 kg m −2 result in a shift of the equilibrium-line altitude of 87.5, 9.8, and −24.3 m, respectively, while perturbations in cloudiness are negligible. The most important influence originates from changing air temperature, as air temperature affects daily heat-flux density of melt and duration of the ablation period. In regimes with negative values of the gradient of annual accumulation, the shift of the equilibrium line is enhanced. |
format |
Article in Journal/Newspaper |
author |
Ambach, W. |
author_facet |
Ambach, W. |
author_sort |
Ambach, W. |
title |
Effects of Climatic Perturbations on the Surface-Ablation Regime of the Greenland Ice Sheet, West Greenland |
title_short |
Effects of Climatic Perturbations on the Surface-Ablation Regime of the Greenland Ice Sheet, West Greenland |
title_full |
Effects of Climatic Perturbations on the Surface-Ablation Regime of the Greenland Ice Sheet, West Greenland |
title_fullStr |
Effects of Climatic Perturbations on the Surface-Ablation Regime of the Greenland Ice Sheet, West Greenland |
title_full_unstemmed |
Effects of Climatic Perturbations on the Surface-Ablation Regime of the Greenland Ice Sheet, West Greenland |
title_sort |
effects of climatic perturbations on the surface-ablation regime of the greenland ice sheet, west greenland |
publisher |
Cambridge University Press (CUP) |
publishDate |
1989 |
url |
http://dx.doi.org/10.1017/s0022143000009229 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000009229 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Ice Sheet Journal of Glaciology |
genre_facet |
Greenland Ice Sheet Journal of Glaciology |
op_source |
Journal of Glaciology volume 35, issue 121, page 311-316 ISSN 0022-1430 1727-5652 |
op_doi |
https://doi.org/10.1017/s0022143000009229 |
container_title |
Journal of Glaciology |
container_volume |
35 |
container_issue |
121 |
container_start_page |
311 |
op_container_end_page |
316 |
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1792500404243660800 |